#!/usr/bin/python -O

__pychecker__ = 'no-shadowbuiltin'

from collections import namedtuple
from itertools import imap
from subprocess import PIPE, Popen
from sys import argv, exit, stderr, stdout


SectionHeader = namedtuple('SectionHeader', ['index', 'name', 'size', 'vma', 'lma', 'offset', 'alignment', 'flags'])


def main():
    if len(argv) < 2:
        print >>stderr, 'Usage: %s [--require] <section-name> [<executable> | <object> | <library>] ...' % argv[0]
        exit(2)
    else:
        args = argv[1:]

    if args[0] == '--require':
        require = True
        args.pop(0)
    else:
        require = False

    desiredSection = args.pop(0)

    for filename in args:
        objdump = Popen(['objdump', '--section-headers', '--wide', filename], stdout=PIPE)

        size = offset = None
        for line in objdump.stdout:
            fields = line.split(None, 7)
            if len(fields) < 7: continue
            header = SectionHeader._make(fields)
            if header.name != desiredSection: continue
            size = int(header.size, 16)
            offset = int(header.offset, 16)
            break;

        if size is None and offset is None:
            if require:
                print >>stderr, '"%s" section is missing' % desiredSection
                exit(1)
            else:
                continue

        if size == 0:
            print >>stderr, '"%s" section is empty' % desiredSection
            continue

        objectFile = open(filename, 'rb')
        objectFile.seek(offset)
        contents = objectFile.read(size)
        #contents = contents.translate(None, '\0')
        stdout.write(contents)


if __name__ == '__main__':
    main()
